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ext4: rename ext4_count_free_blocks() to ext4_count_free_clusters()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / ext4.h
blobf6963cd7f709bd29145d1c37547350f58e782ea8
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #ifdef __KERNEL__
33 #include <linux/compat.h>
34 #endif
35
36 /*
37 * The fourth extended filesystem constants/structures
38 */
39
40 /*
41 * Define EXT4FS_DEBUG to produce debug messages
42 */
43 #undef EXT4FS_DEBUG
44
45 /*
46 * Debug code
47 */
48 #ifdef EXT4FS_DEBUG
49 #define ext4_debug(f, a...) \
50 do { \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
54 } while (0)
55 #else
56 #define ext4_debug(f, a...) do {} while (0)
57 #endif
58
59 #define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
64
65 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
67
68 /* data type for block offset of block group */
69 typedef int ext4_grpblk_t;
70
71 /* data type for filesystem-wide blocks number */
72 typedef unsigned long long ext4_fsblk_t;
73
74 /* data type for file logical block number */
75 typedef __u32 ext4_lblk_t;
76
77 /* data type for block group number */
78 typedef unsigned int ext4_group_t;
79
80 /*
81 * Flags used in mballoc's allocation_context flags field.
82 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
86
87 /* prefer goal again. length */
88 #define EXT4_MB_HINT_MERGE 0x0001
89 /* blocks already reserved */
90 #define EXT4_MB_HINT_RESERVED 0x0002
91 /* metadata is being allocated */
92 #define EXT4_MB_HINT_METADATA 0x0004
93 /* first blocks in the file */
94 #define EXT4_MB_HINT_FIRST 0x0008
95 /* search for the best chunk */
96 #define EXT4_MB_HINT_BEST 0x0010
97 /* data is being allocated */
98 #define EXT4_MB_HINT_DATA 0x0020
99 /* don't preallocate (for tails) */
100 #define EXT4_MB_HINT_NOPREALLOC 0x0040
101 /* allocate for locality group */
102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103 /* allocate goal blocks or none */
104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
105 /* goal is meaningful */
106 #define EXT4_MB_HINT_TRY_GOAL 0x0200
107 /* blocks already pre-reserved by delayed allocation */
108 #define EXT4_MB_DELALLOC_RESERVED 0x0400
109 /* We are doing stream allocation */
110 #define EXT4_MB_STREAM_ALLOC 0x0800
111 /* Use reserved root blocks if needed */
112 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
113
114 struct ext4_allocation_request {
115 /* target inode for block we're allocating */
116 struct inode *inode;
117 /* how many blocks we want to allocate */
118 unsigned int len;
119 /* logical block in target inode */
120 ext4_lblk_t logical;
121 /* the closest logical allocated block to the left */
122 ext4_lblk_t lleft;
123 /* the closest logical allocated block to the right */
124 ext4_lblk_t lright;
125 /* phys. target (a hint) */
126 ext4_fsblk_t goal;
127 /* phys. block for the closest logical allocated block to the left */
128 ext4_fsblk_t pleft;
129 /* phys. block for the closest logical allocated block to the right */
130 ext4_fsblk_t pright;
131 /* flags. see above EXT4_MB_HINT_* */
132 unsigned int flags;
133 };
134
135 /*
136 * Logical to physical block mapping, used by ext4_map_blocks()
137 *
138 * This structure is used to pass requests into ext4_map_blocks() as
139 * well as to store the information returned by ext4_map_blocks(). It
140 * takes less room on the stack than a struct buffer_head.
141 */
142 #define EXT4_MAP_NEW (1 << BH_New)
143 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
144 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
145 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
146 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
147 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
148 * ext4_map_blocks wants to know whether or not the underlying cluster has
149 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
150 * the requested mapping was from previously mapped (or delayed allocated)
151 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
152 * should never appear on buffer_head's state flags.
153 */
154 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
155 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
156 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
157 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
158
159 struct ext4_map_blocks {
160 ext4_fsblk_t m_pblk;
161 ext4_lblk_t m_lblk;
162 unsigned int m_len;
163 unsigned int m_flags;
164 };
165
166 /*
167 * For delayed allocation tracking
168 */
169 struct mpage_da_data {
170 struct inode *inode;
171 sector_t b_blocknr; /* start block number of extent */
172 size_t b_size; /* size of extent */
173 unsigned long b_state; /* state of the extent */
174 unsigned long first_page, next_page; /* extent of pages */
175 struct writeback_control *wbc;
176 int io_done;
177 int pages_written;
178 int retval;
179 };
180
181 /*
182 * Flags for ext4_io_end->flags
183 */
184 #define EXT4_IO_END_UNWRITTEN 0x0001
185 #define EXT4_IO_END_ERROR 0x0002
186 #define EXT4_IO_END_QUEUED 0x0004
187
188 struct ext4_io_page {
189 struct page *p_page;
190 atomic_t p_count;
191 };
192
193 #define MAX_IO_PAGES 128
194
195 typedef struct ext4_io_end {
196 struct list_head list; /* per-file finished IO list */
197 struct inode *inode; /* file being written to */
198 unsigned int flag; /* unwritten or not */
199 struct page *page; /* page struct for buffer write */
200 loff_t offset; /* offset in the file */
201 ssize_t size; /* size of the extent */
202 struct work_struct work; /* data work queue */
203 struct kiocb *iocb; /* iocb struct for AIO */
204 int result; /* error value for AIO */
205 int num_io_pages;
206 struct ext4_io_page *pages[MAX_IO_PAGES];
207 } ext4_io_end_t;
208
209 struct ext4_io_submit {
210 int io_op;
211 struct bio *io_bio;
212 ext4_io_end_t *io_end;
213 struct ext4_io_page *io_page;
214 sector_t io_next_block;
215 };
216
217 /*
218 * Special inodes numbers
219 */
220 #define EXT4_BAD_INO 1 /* Bad blocks inode */
221 #define EXT4_ROOT_INO 2 /* Root inode */
222 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
223 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
224 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
225 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
226 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
227 #define EXT4_JOURNAL_INO 8 /* Journal inode */
228
229 /* First non-reserved inode for old ext4 filesystems */
230 #define EXT4_GOOD_OLD_FIRST_INO 11
231
232 /*
233 * Maximal count of links to a file
234 */
235 #define EXT4_LINK_MAX 65000
236
237 /*
238 * Macro-instructions used to manage several block sizes
239 */
240 #define EXT4_MIN_BLOCK_SIZE 1024
241 #define EXT4_MAX_BLOCK_SIZE 65536
242 #define EXT4_MIN_BLOCK_LOG_SIZE 10
243 #define EXT4_MAX_BLOCK_LOG_SIZE 16
244 #ifdef __KERNEL__
245 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
246 #else
247 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
248 #endif
249 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
250 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
251 EXT4_SB(s)->s_cluster_bits)
252 #ifdef __KERNEL__
253 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
254 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
255 #else
256 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
257 #endif
258 #ifdef __KERNEL__
259 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
260 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
261 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
262 #else
263 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
264 EXT4_GOOD_OLD_INODE_SIZE : \
265 (s)->s_inode_size)
266 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
267 EXT4_GOOD_OLD_FIRST_INO : \
268 (s)->s_first_ino)
269 #endif
270 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
271
272 /* Translate a block number to a cluster number */
273 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
274 /* Translate a cluster number to a block number */
275 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
276 /* Translate # of blks to # of clusters */
277 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
278 (sbi)->s_cluster_bits)
279
280 /*
281 * Structure of a blocks group descriptor
282 */
283 struct ext4_group_desc
284 {
285 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
286 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
287 __le32 bg_inode_table_lo; /* Inodes table block */
288 __le16 bg_free_blocks_count_lo;/* Free blocks count */
289 __le16 bg_free_inodes_count_lo;/* Free inodes count */
290 __le16 bg_used_dirs_count_lo; /* Directories count */
291 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
292 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
293 __le16 bg_itable_unused_lo; /* Unused inodes count */
294 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
295 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
296 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
297 __le32 bg_inode_table_hi; /* Inodes table block MSB */
298 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
299 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
300 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
301 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
302 __u32 bg_reserved2[3];
303 };
304
305 /*
306 * Structure of a flex block group info
307 */
308
309 struct flex_groups {
310 atomic_t free_inodes;
311 atomic_t free_clusters;
312 atomic_t used_dirs;
313 };
314
315 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
316 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
317 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
318
319 /*
320 * Macro-instructions used to manage group descriptors
321 */
322 #define EXT4_MIN_DESC_SIZE 32
323 #define EXT4_MIN_DESC_SIZE_64BIT 64
324 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
325 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
326 #ifdef __KERNEL__
327 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
328 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
329 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
330 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
331 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
332 #else
333 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
335 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
336 #endif
337
338 /*
339 * Constants relative to the data blocks
340 */
341 #define EXT4_NDIR_BLOCKS 12
342 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
343 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
344 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
345 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
346
347 /*
348 * Inode flags
349 */
350 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
351 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
352 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
353 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
354 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
355 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
356 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
357 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
358 /* Reserved for compression usage... */
359 #define EXT4_DIRTY_FL 0x00000100
360 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
361 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
362 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
363 /* End compression flags --- maybe not all used */
364 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
365 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
366 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
367 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
368 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
369 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
370 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
371 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
372 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
373 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
374 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
375
376 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
377 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
378
379 /* Flags that should be inherited by new inodes from their parent. */
380 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
381 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
382 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
383 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
384
385 /* Flags that are appropriate for regular files (all but dir-specific ones). */
386 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
387
388 /* Flags that are appropriate for non-directories/regular files. */
389 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
390
391 /* Mask out flags that are inappropriate for the given type of inode. */
392 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
393 {
394 if (S_ISDIR(mode))
395 return flags;
396 else if (S_ISREG(mode))
397 return flags & EXT4_REG_FLMASK;
398 else
399 return flags & EXT4_OTHER_FLMASK;
400 }
401
402 /*
403 * Inode flags used for atomic set/get
404 */
405 enum {
406 EXT4_INODE_SECRM = 0, /* Secure deletion */
407 EXT4_INODE_UNRM = 1, /* Undelete */
408 EXT4_INODE_COMPR = 2, /* Compress file */
409 EXT4_INODE_SYNC = 3, /* Synchronous updates */
410 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
411 EXT4_INODE_APPEND = 5, /* writes to file may only append */
412 EXT4_INODE_NODUMP = 6, /* do not dump file */
413 EXT4_INODE_NOATIME = 7, /* do not update atime */
414 /* Reserved for compression usage... */
415 EXT4_INODE_DIRTY = 8,
416 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
417 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
418 EXT4_INODE_ECOMPR = 11, /* Compression error */
419 /* End compression flags --- maybe not all used */
420 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
421 EXT4_INODE_IMAGIC = 13, /* AFS directory */
422 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
423 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
424 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
425 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
426 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
427 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
428 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
429 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
430 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
431 };
432
433 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
434 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
435 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
436 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
437
438 /*
439 * Since it's pretty easy to mix up bit numbers and hex values, and we
440 * can't do a compile-time test for ENUM values, we use a run-time
441 * test to make sure that EXT4_XXX_FL is consistent with respect to
442 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
443 * out so it won't cost any extra space in the compiled kernel image.
444 * But it's important that these values are the same, since we are
445 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
446 * must be consistent with the values of FS_XXX_FL defined in
447 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
448 * ext4 filesystems, and of course the values defined in e2fsprogs.
449 *
450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
451 */
452 static inline void ext4_check_flag_values(void)
453 {
454 CHECK_FLAG_VALUE(SECRM);
455 CHECK_FLAG_VALUE(UNRM);
456 CHECK_FLAG_VALUE(COMPR);
457 CHECK_FLAG_VALUE(SYNC);
458 CHECK_FLAG_VALUE(IMMUTABLE);
459 CHECK_FLAG_VALUE(APPEND);
460 CHECK_FLAG_VALUE(NODUMP);
461 CHECK_FLAG_VALUE(NOATIME);
462 CHECK_FLAG_VALUE(DIRTY);
463 CHECK_FLAG_VALUE(COMPRBLK);
464 CHECK_FLAG_VALUE(NOCOMPR);
465 CHECK_FLAG_VALUE(ECOMPR);
466 CHECK_FLAG_VALUE(INDEX);
467 CHECK_FLAG_VALUE(IMAGIC);
468 CHECK_FLAG_VALUE(JOURNAL_DATA);
469 CHECK_FLAG_VALUE(NOTAIL);
470 CHECK_FLAG_VALUE(DIRSYNC);
471 CHECK_FLAG_VALUE(TOPDIR);
472 CHECK_FLAG_VALUE(HUGE_FILE);
473 CHECK_FLAG_VALUE(EXTENTS);
474 CHECK_FLAG_VALUE(EA_INODE);
475 CHECK_FLAG_VALUE(EOFBLOCKS);
476 CHECK_FLAG_VALUE(RESERVED);
477 }
478
479 /* Used to pass group descriptor data when online resize is done */
480 struct ext4_new_group_input {
481 __u32 group; /* Group number for this data */
482 __u64 block_bitmap; /* Absolute block number of block bitmap */
483 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
484 __u64 inode_table; /* Absolute block number of inode table start */
485 __u32 blocks_count; /* Total number of blocks in this group */
486 __u16 reserved_blocks; /* Number of reserved blocks in this group */
487 __u16 unused;
488 };
489
490 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
491 struct compat_ext4_new_group_input {
492 u32 group;
493 compat_u64 block_bitmap;
494 compat_u64 inode_bitmap;
495 compat_u64 inode_table;
496 u32 blocks_count;
497 u16 reserved_blocks;
498 u16 unused;
499 };
500 #endif
501
502 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
503 struct ext4_new_group_data {
504 __u32 group;
505 __u64 block_bitmap;
506 __u64 inode_bitmap;
507 __u64 inode_table;
508 __u32 blocks_count;
509 __u16 reserved_blocks;
510 __u16 unused;
511 __u32 free_blocks_count;
512 };
513
514 /*
515 * Flags used by ext4_map_blocks()
516 */
517 /* Allocate any needed blocks and/or convert an unitialized
518 extent to be an initialized ext4 */
519 #define EXT4_GET_BLOCKS_CREATE 0x0001
520 /* Request the creation of an unitialized extent */
521 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
522 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
523 EXT4_GET_BLOCKS_CREATE)
524 /* Caller is from the delayed allocation writeout path,
525 so set the magic i_delalloc_reserve_flag after taking the
526 inode allocation semaphore for */
527 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
528 /* caller is from the direct IO path, request to creation of an
529 unitialized extents if not allocated, split the uninitialized
530 extent if blocks has been preallocated already*/
531 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
532 #define EXT4_GET_BLOCKS_CONVERT 0x0010
533 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
534 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
535 /* Convert extent to initialized after IO complete */
536 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
537 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
538 /* Punch out blocks of an extent */
539 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
540 /* Don't normalize allocation size (used for fallocate) */
541 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
542
543 /*
544 * Flags used by ext4_free_blocks
545 */
546 #define EXT4_FREE_BLOCKS_METADATA 0x0001
547 #define EXT4_FREE_BLOCKS_FORGET 0x0002
548 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
549 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
550 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
551 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
552
553 /*
554 * Flags used by ext4_discard_partial_page_buffers
555 */
556 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
557
558 /*
559 * ioctl commands
560 */
561 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
562 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
563 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
564 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
565 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
566 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
567 #ifdef CONFIG_JBD2_DEBUG
568 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
569 #endif
570 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
571 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
572 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
573 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
574 #define EXT4_IOC_MIGRATE _IO('f', 9)
575 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
576 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
577 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
578 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
579
580 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
581 /*
582 * ioctl commands in 32 bit emulation
583 */
584 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
585 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
586 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
587 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
588 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
589 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
590 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
591 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
592 #ifdef CONFIG_JBD2_DEBUG
593 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
594 #endif
595 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
596 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
597 #endif
598
599 /* Max physical block we can address w/o extents */
600 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
601
602 /*
603 * Structure of an inode on the disk
604 */
605 struct ext4_inode {
606 __le16 i_mode; /* File mode */
607 __le16 i_uid; /* Low 16 bits of Owner Uid */
608 __le32 i_size_lo; /* Size in bytes */
609 __le32 i_atime; /* Access time */
610 __le32 i_ctime; /* Inode Change time */
611 __le32 i_mtime; /* Modification time */
612 __le32 i_dtime; /* Deletion Time */
613 __le16 i_gid; /* Low 16 bits of Group Id */
614 __le16 i_links_count; /* Links count */
615 __le32 i_blocks_lo; /* Blocks count */
616 __le32 i_flags; /* File flags */
617 union {
618 struct {
619 __le32 l_i_version;
620 } linux1;
621 struct {
622 __u32 h_i_translator;
623 } hurd1;
624 struct {
625 __u32 m_i_reserved1;
626 } masix1;
627 } osd1; /* OS dependent 1 */
628 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
629 __le32 i_generation; /* File version (for NFS) */
630 __le32 i_file_acl_lo; /* File ACL */
631 __le32 i_size_high;
632 __le32 i_obso_faddr; /* Obsoleted fragment address */
633 union {
634 struct {
635 __le16 l_i_blocks_high; /* were l_i_reserved1 */
636 __le16 l_i_file_acl_high;
637 __le16 l_i_uid_high; /* these 2 fields */
638 __le16 l_i_gid_high; /* were reserved2[0] */
639 __u32 l_i_reserved2;
640 } linux2;
641 struct {
642 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
643 __u16 h_i_mode_high;
644 __u16 h_i_uid_high;
645 __u16 h_i_gid_high;
646 __u32 h_i_author;
647 } hurd2;
648 struct {
649 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
650 __le16 m_i_file_acl_high;
651 __u32 m_i_reserved2[2];
652 } masix2;
653 } osd2; /* OS dependent 2 */
654 __le16 i_extra_isize;
655 __le16 i_pad1;
656 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
657 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
658 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
659 __le32 i_crtime; /* File Creation time */
660 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
661 __le32 i_version_hi; /* high 32 bits for 64-bit version */
662 };
663
664 struct move_extent {
665 __u32 reserved; /* should be zero */
666 __u32 donor_fd; /* donor file descriptor */
667 __u64 orig_start; /* logical start offset in block for orig */
668 __u64 donor_start; /* logical start offset in block for donor */
669 __u64 len; /* block length to be moved */
670 __u64 moved_len; /* moved block length */
671 };
672
673 #define EXT4_EPOCH_BITS 2
674 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
675 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
676
677 /*
678 * Extended fields will fit into an inode if the filesystem was formatted
679 * with large inodes (-I 256 or larger) and there are not currently any EAs
680 * consuming all of the available space. For new inodes we always reserve
681 * enough space for the kernel's known extended fields, but for inodes
682 * created with an old kernel this might not have been the case. None of
683 * the extended inode fields is critical for correct filesystem operation.
684 * This macro checks if a certain field fits in the inode. Note that
685 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
686 */
687 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
688 ((offsetof(typeof(*ext4_inode), field) + \
689 sizeof((ext4_inode)->field)) \
690 <= (EXT4_GOOD_OLD_INODE_SIZE + \
691 (einode)->i_extra_isize)) \
692
693 static inline __le32 ext4_encode_extra_time(struct timespec *time)
694 {
695 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
696 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
697 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
698 }
699
700 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
701 {
702 if (sizeof(time->tv_sec) > 4)
703 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
704 << 32;
705 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
706 }
707
708 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
709 do { \
710 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
711 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
712 (raw_inode)->xtime ## _extra = \
713 ext4_encode_extra_time(&(inode)->xtime); \
714 } while (0)
715
716 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
717 do { \
718 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
719 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
720 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
721 (raw_inode)->xtime ## _extra = \
722 ext4_encode_extra_time(&(einode)->xtime); \
723 } while (0)
724
725 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
726 do { \
727 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
728 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
729 ext4_decode_extra_time(&(inode)->xtime, \
730 raw_inode->xtime ## _extra); \
731 else \
732 (inode)->xtime.tv_nsec = 0; \
733 } while (0)
734
735 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
736 do { \
737 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
738 (einode)->xtime.tv_sec = \
739 (signed)le32_to_cpu((raw_inode)->xtime); \
740 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
741 ext4_decode_extra_time(&(einode)->xtime, \
742 raw_inode->xtime ## _extra); \
743 else \
744 (einode)->xtime.tv_nsec = 0; \
745 } while (0)
746
747 #define i_disk_version osd1.linux1.l_i_version
748
749 #if defined(__KERNEL__) || defined(__linux__)
750 #define i_reserved1 osd1.linux1.l_i_reserved1
751 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
752 #define i_blocks_high osd2.linux2.l_i_blocks_high
753 #define i_uid_low i_uid
754 #define i_gid_low i_gid
755 #define i_uid_high osd2.linux2.l_i_uid_high
756 #define i_gid_high osd2.linux2.l_i_gid_high
757 #define i_reserved2 osd2.linux2.l_i_reserved2
758
759 #elif defined(__GNU__)
760
761 #define i_translator osd1.hurd1.h_i_translator
762 #define i_uid_high osd2.hurd2.h_i_uid_high
763 #define i_gid_high osd2.hurd2.h_i_gid_high
764 #define i_author osd2.hurd2.h_i_author
765
766 #elif defined(__masix__)
767
768 #define i_reserved1 osd1.masix1.m_i_reserved1
769 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
770 #define i_reserved2 osd2.masix2.m_i_reserved2
771
772 #endif /* defined(__KERNEL__) || defined(__linux__) */
773
774 /*
775 * storage for cached extent
776 * If ec_len == 0, then the cache is invalid.
777 * If ec_start == 0, then the cache represents a gap (null mapping)
778 */
779 struct ext4_ext_cache {
780 ext4_fsblk_t ec_start;
781 ext4_lblk_t ec_block;
782 __u32 ec_len; /* must be 32bit to return holes */
783 };
784
785 /*
786 * fourth extended file system inode data in memory
787 */
788 struct ext4_inode_info {
789 __le32 i_data[15]; /* unconverted */
790 __u32 i_dtime;
791 ext4_fsblk_t i_file_acl;
792
793 /*
794 * i_block_group is the number of the block group which contains
795 * this file's inode. Constant across the lifetime of the inode,
796 * it is ued for making block allocation decisions - we try to
797 * place a file's data blocks near its inode block, and new inodes
798 * near to their parent directory's inode.
799 */
800 ext4_group_t i_block_group;
801 ext4_lblk_t i_dir_start_lookup;
802 #if (BITS_PER_LONG < 64)
803 unsigned long i_state_flags; /* Dynamic state flags */
804 #endif
805 unsigned long i_flags;
806
807 #ifdef CONFIG_EXT4_FS_XATTR
808 /*
809 * Extended attributes can be read independently of the main file
810 * data. Taking i_mutex even when reading would cause contention
811 * between readers of EAs and writers of regular file data, so
812 * instead we synchronize on xattr_sem when reading or changing
813 * EAs.
814 */
815 struct rw_semaphore xattr_sem;
816 #endif
817
818 struct list_head i_orphan; /* unlinked but open inodes */
819
820 /*
821 * i_disksize keeps track of what the inode size is ON DISK, not
822 * in memory. During truncate, i_size is set to the new size by
823 * the VFS prior to calling ext4_truncate(), but the filesystem won't
824 * set i_disksize to 0 until the truncate is actually under way.
825 *
826 * The intent is that i_disksize always represents the blocks which
827 * are used by this file. This allows recovery to restart truncate
828 * on orphans if we crash during truncate. We actually write i_disksize
829 * into the on-disk inode when writing inodes out, instead of i_size.
830 *
831 * The only time when i_disksize and i_size may be different is when
832 * a truncate is in progress. The only things which change i_disksize
833 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
834 */
835 loff_t i_disksize;
836
837 /*
838 * i_data_sem is for serialising ext4_truncate() against
839 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
840 * data tree are chopped off during truncate. We can't do that in
841 * ext4 because whenever we perform intermediate commits during
842 * truncate, the inode and all the metadata blocks *must* be in a
843 * consistent state which allows truncation of the orphans to restart
844 * during recovery. Hence we must fix the get_block-vs-truncate race
845 * by other means, so we have i_data_sem.
846 */
847 struct rw_semaphore i_data_sem;
848 struct inode vfs_inode;
849 struct jbd2_inode *jinode;
850
851 struct ext4_ext_cache i_cached_extent;
852 /*
853 * File creation time. Its function is same as that of
854 * struct timespec i_{a,c,m}time in the generic inode.
855 */
856 struct timespec i_crtime;
857
858 /* mballoc */
859 struct list_head i_prealloc_list;
860 spinlock_t i_prealloc_lock;
861
862 /* ialloc */
863 ext4_group_t i_last_alloc_group;
864
865 /* allocation reservation info for delalloc */
866 /* In case of bigalloc, these refer to clusters rather than blocks */
867 unsigned int i_reserved_data_blocks;
868 unsigned int i_reserved_meta_blocks;
869 unsigned int i_allocated_meta_blocks;
870 ext4_lblk_t i_da_metadata_calc_last_lblock;
871 int i_da_metadata_calc_len;
872
873 /* on-disk additional length */
874 __u16 i_extra_isize;
875
876 #ifdef CONFIG_QUOTA
877 /* quota space reservation, managed internally by quota code */
878 qsize_t i_reserved_quota;
879 #endif
880
881 /* completed IOs that might need unwritten extents handling */
882 struct list_head i_completed_io_list;
883 spinlock_t i_completed_io_lock;
884 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
885 /* current io_end structure for async DIO write*/
886 ext4_io_end_t *cur_aio_dio;
887 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
888
889 spinlock_t i_block_reservation_lock;
890
891 /*
892 * Transactions that contain inode's metadata needed to complete
893 * fsync and fdatasync, respectively.
894 */
895 tid_t i_sync_tid;
896 tid_t i_datasync_tid;
897 };
898
899 /*
900 * File system states
901 */
902 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
903 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
904 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
905
906 /*
907 * Misc. filesystem flags
908 */
909 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
910 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
911 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
912
913 /*
914 * Mount flags
915 */
916 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
917 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
918 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
919 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
920 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
921 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
922 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
923 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
924 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
925 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
926 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
927 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
928 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
929 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
930 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
931 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
932 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
933 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
934 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
935 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
936 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
937 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
938 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
939 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
940 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
941 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
942 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
943 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
944 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
945 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
946 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
947
948 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
949 specified delalloc */
950
951 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
952 ~EXT4_MOUNT_##opt
953 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
954 EXT4_MOUNT_##opt
955 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
956 EXT4_MOUNT_##opt)
957
958 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
959 ~EXT4_MOUNT2_##opt
960 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
961 EXT4_MOUNT2_##opt
962 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
963 EXT4_MOUNT2_##opt)
964
965 #define ext4_set_bit __test_and_set_bit_le
966 #define ext4_set_bit_atomic ext2_set_bit_atomic
967 #define ext4_clear_bit __test_and_clear_bit_le
968 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
969 #define ext4_test_bit test_bit_le
970 #define ext4_find_first_zero_bit find_first_zero_bit_le
971 #define ext4_find_next_zero_bit find_next_zero_bit_le
972 #define ext4_find_next_bit find_next_bit_le
973
974 extern void ext4_set_bits(void *bm, int cur, int len);
975
976 /*
977 * Maximal mount counts between two filesystem checks
978 */
979 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
980 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
981
982 /*
983 * Behaviour when detecting errors
984 */
985 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
986 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
987 #define EXT4_ERRORS_PANIC 3 /* Panic */
988 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
989
990 /*
991 * Structure of the super block
992 */
993 struct ext4_super_block {
994 /*00*/ __le32 s_inodes_count; /* Inodes count */
995 __le32 s_blocks_count_lo; /* Blocks count */
996 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
997 __le32 s_free_blocks_count_lo; /* Free blocks count */
998 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
999 __le32 s_first_data_block; /* First Data Block */
1000 __le32 s_log_block_size; /* Block size */
1001 __le32 s_log_cluster_size; /* Allocation cluster size */
1002 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1003 __le32 s_clusters_per_group; /* # Clusters per group */
1004 __le32 s_inodes_per_group; /* # Inodes per group */
1005 __le32 s_mtime; /* Mount time */
1006 /*30*/ __le32 s_wtime; /* Write time */
1007 __le16 s_mnt_count; /* Mount count */
1008 __le16 s_max_mnt_count; /* Maximal mount count */
1009 __le16 s_magic; /* Magic signature */
1010 __le16 s_state; /* File system state */
1011 __le16 s_errors; /* Behaviour when detecting errors */
1012 __le16 s_minor_rev_level; /* minor revision level */
1013 /*40*/ __le32 s_lastcheck; /* time of last check */
1014 __le32 s_checkinterval; /* max. time between checks */
1015 __le32 s_creator_os; /* OS */
1016 __le32 s_rev_level; /* Revision level */
1017 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1018 __le16 s_def_resgid; /* Default gid for reserved blocks */
1019 /*
1020 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1021 *
1022 * Note: the difference between the compatible feature set and
1023 * the incompatible feature set is that if there is a bit set
1024 * in the incompatible feature set that the kernel doesn't
1025 * know about, it should refuse to mount the filesystem.
1026 *
1027 * e2fsck's requirements are more strict; if it doesn't know
1028 * about a feature in either the compatible or incompatible
1029 * feature set, it must abort and not try to meddle with
1030 * things it doesn't understand...
1031 */
1032 __le32 s_first_ino; /* First non-reserved inode */
1033 __le16 s_inode_size; /* size of inode structure */
1034 __le16 s_block_group_nr; /* block group # of this superblock */
1035 __le32 s_feature_compat; /* compatible feature set */
1036 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1037 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1038 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1039 /*78*/ char s_volume_name[16]; /* volume name */
1040 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1041 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1042 /*
1043 * Performance hints. Directory preallocation should only
1044 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1045 */
1046 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1047 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1048 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1049 /*
1050 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1051 */
1052 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1053 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1054 __le32 s_journal_dev; /* device number of journal file */
1055 __le32 s_last_orphan; /* start of list of inodes to delete */
1056 __le32 s_hash_seed[4]; /* HTREE hash seed */
1057 __u8 s_def_hash_version; /* Default hash version to use */
1058 __u8 s_jnl_backup_type;
1059 __le16 s_desc_size; /* size of group descriptor */
1060 /*100*/ __le32 s_default_mount_opts;
1061 __le32 s_first_meta_bg; /* First metablock block group */
1062 __le32 s_mkfs_time; /* When the filesystem was created */
1063 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1064 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1065 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1066 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1067 __le32 s_free_blocks_count_hi; /* Free blocks count */
1068 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1069 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1070 __le32 s_flags; /* Miscellaneous flags */
1071 __le16 s_raid_stride; /* RAID stride */
1072 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1073 __le64 s_mmp_block; /* Block for multi-mount protection */
1074 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1075 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1076 __u8 s_reserved_char_pad;
1077 __le16 s_reserved_pad;
1078 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1079 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1080 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1081 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1082 snapshot's future use */
1083 __le32 s_snapshot_list; /* inode number of the head of the
1084 on-disk snapshot list */
1085 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1086 __le32 s_error_count; /* number of fs errors */
1087 __le32 s_first_error_time; /* first time an error happened */
1088 __le32 s_first_error_ino; /* inode involved in first error */
1089 __le64 s_first_error_block; /* block involved of first error */
1090 __u8 s_first_error_func[32]; /* function where the error happened */
1091 __le32 s_first_error_line; /* line number where error happened */
1092 __le32 s_last_error_time; /* most recent time of an error */
1093 __le32 s_last_error_ino; /* inode involved in last error */
1094 __le32 s_last_error_line; /* line number where error happened */
1095 __le64 s_last_error_block; /* block involved of last error */
1096 __u8 s_last_error_func[32]; /* function where the error happened */
1097 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1098 __u8 s_mount_opts[64];
1099 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1100 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1101 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1102 __le32 s_reserved[109]; /* Padding to the end of the block */
1103 };
1104
1105 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1106
1107 #ifdef __KERNEL__
1108
1109 /*
1110 * run-time mount flags
1111 */
1112 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1113 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1114
1115 /*
1116 * fourth extended-fs super-block data in memory
1117 */
1118 struct ext4_sb_info {
1119 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1120 unsigned long s_inodes_per_block;/* Number of inodes per block */
1121 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1122 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1123 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1124 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1125 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1126 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1127 ext4_group_t s_groups_count; /* Number of groups in the fs */
1128 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1129 unsigned long s_overhead_last; /* Last calculated overhead */
1130 unsigned long s_blocks_last; /* Last seen block count */
1131 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1132 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1133 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1134 struct buffer_head * s_sbh; /* Buffer containing the super block */
1135 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1136 struct buffer_head **s_group_desc;
1137 unsigned int s_mount_opt;
1138 unsigned int s_mount_opt2;
1139 unsigned int s_mount_flags;
1140 ext4_fsblk_t s_sb_block;
1141 uid_t s_resuid;
1142 gid_t s_resgid;
1143 unsigned short s_mount_state;
1144 unsigned short s_pad;
1145 int s_addr_per_block_bits;
1146 int s_desc_per_block_bits;
1147 int s_inode_size;
1148 int s_first_ino;
1149 unsigned int s_inode_readahead_blks;
1150 unsigned int s_inode_goal;
1151 spinlock_t s_next_gen_lock;
1152 u32 s_next_generation;
1153 u32 s_hash_seed[4];
1154 int s_def_hash_version;
1155 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1156 struct percpu_counter s_freeclusters_counter;
1157 struct percpu_counter s_freeinodes_counter;
1158 struct percpu_counter s_dirs_counter;
1159 struct percpu_counter s_dirtyclusters_counter;
1160 struct blockgroup_lock *s_blockgroup_lock;
1161 struct proc_dir_entry *s_proc;
1162 struct kobject s_kobj;
1163 struct completion s_kobj_unregister;
1164
1165 /* Journaling */
1166 struct journal_s *s_journal;
1167 struct list_head s_orphan;
1168 struct mutex s_orphan_lock;
1169 unsigned long s_resize_flags; /* Flags indicating if there
1170 is a resizer */
1171 unsigned long s_commit_interval;
1172 u32 s_max_batch_time;
1173 u32 s_min_batch_time;
1174 struct block_device *journal_bdev;
1175 #ifdef CONFIG_JBD2_DEBUG
1176 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1177 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1178 #endif
1179 #ifdef CONFIG_QUOTA
1180 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1181 int s_jquota_fmt; /* Format of quota to use */
1182 #endif
1183 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1184 struct rb_root system_blks;
1185
1186 #ifdef EXTENTS_STATS
1187 /* ext4 extents stats */
1188 unsigned long s_ext_min;
1189 unsigned long s_ext_max;
1190 unsigned long s_depth_max;
1191 spinlock_t s_ext_stats_lock;
1192 unsigned long s_ext_blocks;
1193 unsigned long s_ext_extents;
1194 #endif
1195 /* ext4 extent cache stats */
1196 unsigned long extent_cache_hits;
1197 unsigned long extent_cache_misses;
1198
1199 /* for buddy allocator */
1200 struct ext4_group_info ***s_group_info;
1201 struct inode *s_buddy_cache;
1202 spinlock_t s_md_lock;
1203 unsigned short *s_mb_offsets;
1204 unsigned int *s_mb_maxs;
1205
1206 /* tunables */
1207 unsigned long s_stripe;
1208 unsigned int s_mb_stream_request;
1209 unsigned int s_mb_max_to_scan;
1210 unsigned int s_mb_min_to_scan;
1211 unsigned int s_mb_stats;
1212 unsigned int s_mb_order2_reqs;
1213 unsigned int s_mb_group_prealloc;
1214 unsigned int s_max_writeback_mb_bump;
1215 /* where last allocation was done - for stream allocation */
1216 unsigned long s_mb_last_group;
1217 unsigned long s_mb_last_start;
1218
1219 /* stats for buddy allocator */
1220 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1221 atomic_t s_bal_success; /* we found long enough chunks */
1222 atomic_t s_bal_allocated; /* in blocks */
1223 atomic_t s_bal_ex_scanned; /* total extents scanned */
1224 atomic_t s_bal_goals; /* goal hits */
1225 atomic_t s_bal_breaks; /* too long searches */
1226 atomic_t s_bal_2orders; /* 2^order hits */
1227 spinlock_t s_bal_lock;
1228 unsigned long s_mb_buddies_generated;
1229 unsigned long long s_mb_generation_time;
1230 atomic_t s_mb_lost_chunks;
1231 atomic_t s_mb_preallocated;
1232 atomic_t s_mb_discarded;
1233 atomic_t s_lock_busy;
1234
1235 /* locality groups */
1236 struct ext4_locality_group __percpu *s_locality_groups;
1237
1238 /* for write statistics */
1239 unsigned long s_sectors_written_start;
1240 u64 s_kbytes_written;
1241
1242 unsigned int s_log_groups_per_flex;
1243 struct flex_groups *s_flex_groups;
1244
1245 /* workqueue for dio unwritten */
1246 struct workqueue_struct *dio_unwritten_wq;
1247
1248 /* timer for periodic error stats printing */
1249 struct timer_list s_err_report;
1250
1251 /* Lazy inode table initialization info */
1252 struct ext4_li_request *s_li_request;
1253 /* Wait multiplier for lazy initialization thread */
1254 unsigned int s_li_wait_mult;
1255
1256 /* Kernel thread for multiple mount protection */
1257 struct task_struct *s_mmp_tsk;
1258
1259 /* record the last minlen when FITRIM is called. */
1260 atomic_t s_last_trim_minblks;
1261 };
1262
1263 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1264 {
1265 return sb->s_fs_info;
1266 }
1267 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1268 {
1269 return container_of(inode, struct ext4_inode_info, vfs_inode);
1270 }
1271
1272 static inline struct timespec ext4_current_time(struct inode *inode)
1273 {
1274 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1275 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1276 }
1277
1278 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1279 {
1280 return ino == EXT4_ROOT_INO ||
1281 ino == EXT4_JOURNAL_INO ||
1282 ino == EXT4_RESIZE_INO ||
1283 (ino >= EXT4_FIRST_INO(sb) &&
1284 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1285 }
1286
1287 /*
1288 * Inode dynamic state flags
1289 */
1290 enum {
1291 EXT4_STATE_JDATA, /* journaled data exists */
1292 EXT4_STATE_NEW, /* inode is newly created */
1293 EXT4_STATE_XATTR, /* has in-inode xattrs */
1294 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1295 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1296 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1297 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1298 EXT4_STATE_NEWENTRY, /* File just added to dir */
1299 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1300 };
1301
1302 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1303 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1304 { \
1305 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1306 } \
1307 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1308 { \
1309 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1310 } \
1311 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1312 { \
1313 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1314 }
1315
1316 EXT4_INODE_BIT_FNS(flag, flags, 0)
1317 #if (BITS_PER_LONG < 64)
1318 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1319
1320 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1321 {
1322 (ei)->i_state_flags = 0;
1323 }
1324 #else
1325 EXT4_INODE_BIT_FNS(state, flags, 32)
1326
1327 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1328 {
1329 /* We depend on the fact that callers will set i_flags */
1330 }
1331 #endif
1332 #else
1333 /* Assume that user mode programs are passing in an ext4fs superblock, not
1334 * a kernel struct super_block. This will allow us to call the feature-test
1335 * macros from user land. */
1336 #define EXT4_SB(sb) (sb)
1337 #endif
1338
1339 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1340
1341 /*
1342 * Codes for operating systems
1343 */
1344 #define EXT4_OS_LINUX 0
1345 #define EXT4_OS_HURD 1
1346 #define EXT4_OS_MASIX 2
1347 #define EXT4_OS_FREEBSD 3
1348 #define EXT4_OS_LITES 4
1349
1350 /*
1351 * Revision levels
1352 */
1353 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1354 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1355
1356 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1357 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1358
1359 #define EXT4_GOOD_OLD_INODE_SIZE 128
1360
1361 /*
1362 * Feature set definitions
1363 */
1364
1365 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1366 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1367 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1368 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1369 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1370 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1371 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1372 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1373 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1374 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1375 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1376 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1377 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1378 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1379 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1380 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1381 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1382 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1383
1384 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1385 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1386 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1387 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1388 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1389 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1390
1391 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1392 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1393 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1394 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1395 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1396 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1397 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1398 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1399 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1400
1401 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1402 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1403 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1404 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1405 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1406 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1407 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1408 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1409 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1410 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1411 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1412
1413 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1414 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1415 EXT4_FEATURE_INCOMPAT_META_BG)
1416 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1417 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1418 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1419
1420 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1421 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1422 EXT4_FEATURE_INCOMPAT_RECOVER| \
1423 EXT4_FEATURE_INCOMPAT_META_BG)
1424 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1425 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1426 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1427
1428 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1429 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1430 EXT4_FEATURE_INCOMPAT_RECOVER| \
1431 EXT4_FEATURE_INCOMPAT_META_BG| \
1432 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1433 EXT4_FEATURE_INCOMPAT_64BIT| \
1434 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1435 EXT4_FEATURE_INCOMPAT_MMP)
1436 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1437 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1438 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1439 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1440 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1441 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1442 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1443 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
1444
1445 /*
1446 * Default values for user and/or group using reserved blocks
1447 */
1448 #define EXT4_DEF_RESUID 0
1449 #define EXT4_DEF_RESGID 0
1450
1451 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1452
1453 /*
1454 * Default mount options
1455 */
1456 #define EXT4_DEFM_DEBUG 0x0001
1457 #define EXT4_DEFM_BSDGROUPS 0x0002
1458 #define EXT4_DEFM_XATTR_USER 0x0004
1459 #define EXT4_DEFM_ACL 0x0008
1460 #define EXT4_DEFM_UID16 0x0010
1461 #define EXT4_DEFM_JMODE 0x0060
1462 #define EXT4_DEFM_JMODE_DATA 0x0020
1463 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1464 #define EXT4_DEFM_JMODE_WBACK 0x0060
1465 #define EXT4_DEFM_NOBARRIER 0x0100
1466 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1467 #define EXT4_DEFM_DISCARD 0x0400
1468 #define EXT4_DEFM_NODELALLOC 0x0800
1469
1470 /*
1471 * Default journal batch times
1472 */
1473 #define EXT4_DEF_MIN_BATCH_TIME 0
1474 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1475
1476 /*
1477 * Minimum number of groups in a flexgroup before we separate out
1478 * directories into the first block group of a flexgroup
1479 */
1480 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1481
1482 /*
1483 * Structure of a directory entry
1484 */
1485 #define EXT4_NAME_LEN 255
1486
1487 struct ext4_dir_entry {
1488 __le32 inode; /* Inode number */
1489 __le16 rec_len; /* Directory entry length */
1490 __le16 name_len; /* Name length */
1491 char name[EXT4_NAME_LEN]; /* File name */
1492 };
1493
1494 /*
1495 * The new version of the directory entry. Since EXT4 structures are
1496 * stored in intel byte order, and the name_len field could never be
1497 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1498 * file_type field.
1499 */
1500 struct ext4_dir_entry_2 {
1501 __le32 inode; /* Inode number */
1502 __le16 rec_len; /* Directory entry length */
1503 __u8 name_len; /* Name length */
1504 __u8 file_type;
1505 char name[EXT4_NAME_LEN]; /* File name */
1506 };
1507
1508 /*
1509 * Ext4 directory file types. Only the low 3 bits are used. The
1510 * other bits are reserved for now.
1511 */
1512 #define EXT4_FT_UNKNOWN 0
1513 #define EXT4_FT_REG_FILE 1
1514 #define EXT4_FT_DIR 2
1515 #define EXT4_FT_CHRDEV 3
1516 #define EXT4_FT_BLKDEV 4
1517 #define EXT4_FT_FIFO 5
1518 #define EXT4_FT_SOCK 6
1519 #define EXT4_FT_SYMLINK 7
1520
1521 #define EXT4_FT_MAX 8
1522
1523 /*
1524 * EXT4_DIR_PAD defines the directory entries boundaries
1525 *
1526 * NOTE: It must be a multiple of 4
1527 */
1528 #define EXT4_DIR_PAD 4
1529 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1530 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1531 ~EXT4_DIR_ROUND)
1532 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1533
1534 /*
1535 * If we ever get support for fs block sizes > page_size, we'll need
1536 * to remove the #if statements in the next two functions...
1537 */
1538 static inline unsigned int
1539 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1540 {
1541 unsigned len = le16_to_cpu(dlen);
1542
1543 #if (PAGE_CACHE_SIZE >= 65536)
1544 if (len == EXT4_MAX_REC_LEN || len == 0)
1545 return blocksize;
1546 return (len & 65532) | ((len & 3) << 16);
1547 #else
1548 return len;
1549 #endif
1550 }
1551
1552 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1553 {
1554 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1555 BUG();
1556 #if (PAGE_CACHE_SIZE >= 65536)
1557 if (len < 65536)
1558 return cpu_to_le16(len);
1559 if (len == blocksize) {
1560 if (blocksize == 65536)
1561 return cpu_to_le16(EXT4_MAX_REC_LEN);
1562 else
1563 return cpu_to_le16(0);
1564 }
1565 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1566 #else
1567 return cpu_to_le16(len);
1568 #endif
1569 }
1570
1571 /*
1572 * Hash Tree Directory indexing
1573 * (c) Daniel Phillips, 2001
1574 */
1575
1576 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1577 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1578 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1579 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1580 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1581
1582 /* Legal values for the dx_root hash_version field: */
1583
1584 #define DX_HASH_LEGACY 0
1585 #define DX_HASH_HALF_MD4 1
1586 #define DX_HASH_TEA 2
1587 #define DX_HASH_LEGACY_UNSIGNED 3
1588 #define DX_HASH_HALF_MD4_UNSIGNED 4
1589 #define DX_HASH_TEA_UNSIGNED 5
1590
1591 #ifdef __KERNEL__
1592
1593 /* hash info structure used by the directory hash */
1594 struct dx_hash_info
1595 {
1596 u32 hash;
1597 u32 minor_hash;
1598 int hash_version;
1599 u32 *seed;
1600 };
1601
1602 #define EXT4_HTREE_EOF 0x7fffffff
1603
1604 /*
1605 * Control parameters used by ext4_htree_next_block
1606 */
1607 #define HASH_NB_ALWAYS 1
1608
1609
1610 /*
1611 * Describe an inode's exact location on disk and in memory
1612 */
1613 struct ext4_iloc
1614 {
1615 struct buffer_head *bh;
1616 unsigned long offset;
1617 ext4_group_t block_group;
1618 };
1619
1620 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1621 {
1622 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1623 }
1624
1625 /*
1626 * This structure is stuffed into the struct file's private_data field
1627 * for directories. It is where we put information so that we can do
1628 * readdir operations in hash tree order.
1629 */
1630 struct dir_private_info {
1631 struct rb_root root;
1632 struct rb_node *curr_node;
1633 struct fname *extra_fname;
1634 loff_t last_pos;
1635 __u32 curr_hash;
1636 __u32 curr_minor_hash;
1637 __u32 next_hash;
1638 };
1639
1640 /* calculate the first block number of the group */
1641 static inline ext4_fsblk_t
1642 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1643 {
1644 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1645 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1646 }
1647
1648 /*
1649 * Special error return code only used by dx_probe() and its callers.
1650 */
1651 #define ERR_BAD_DX_DIR -75000
1652
1653 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1654 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1655
1656 /*
1657 * Timeout and state flag for lazy initialization inode thread.
1658 */
1659 #define EXT4_DEF_LI_WAIT_MULT 10
1660 #define EXT4_DEF_LI_MAX_START_DELAY 5
1661 #define EXT4_LAZYINIT_QUIT 0x0001
1662 #define EXT4_LAZYINIT_RUNNING 0x0002
1663
1664 /*
1665 * Lazy inode table initialization info
1666 */
1667 struct ext4_lazy_init {
1668 unsigned long li_state;
1669 struct list_head li_request_list;
1670 struct mutex li_list_mtx;
1671 };
1672
1673 struct ext4_li_request {
1674 struct super_block *lr_super;
1675 struct ext4_sb_info *lr_sbi;
1676 ext4_group_t lr_next_group;
1677 struct list_head lr_request;
1678 unsigned long lr_next_sched;
1679 unsigned long lr_timeout;
1680 };
1681
1682 struct ext4_features {
1683 struct kobject f_kobj;
1684 struct completion f_kobj_unregister;
1685 };
1686
1687 /*
1688 * This structure will be used for multiple mount protection. It will be
1689 * written into the block number saved in the s_mmp_block field in the
1690 * superblock. Programs that check MMP should assume that if
1691 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1692 * to use the filesystem, regardless of how old the timestamp is.
1693 */
1694 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1695 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1696 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1697 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1698
1699 struct mmp_struct {
1700 __le32 mmp_magic; /* Magic number for MMP */
1701 __le32 mmp_seq; /* Sequence no. updated periodically */
1702
1703 /*
1704 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1705 * purposes and do not affect the correctness of the algorithm
1706 */
1707 __le64 mmp_time; /* Time last updated */
1708 char mmp_nodename[64]; /* Node which last updated MMP block */
1709 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1710
1711 /*
1712 * mmp_check_interval is used to verify if the MMP block has been
1713 * updated on the block device. The value is updated based on the
1714 * maximum time to write the MMP block during an update cycle.
1715 */
1716 __le16 mmp_check_interval;
1717
1718 __le16 mmp_pad1;
1719 __le32 mmp_pad2[227];
1720 };
1721
1722 /* arguments passed to the mmp thread */
1723 struct mmpd_data {
1724 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1725 struct super_block *sb; /* super block of the fs */
1726 };
1727
1728 /*
1729 * Check interval multiplier
1730 * The MMP block is written every update interval and initially checked every
1731 * update interval x the multiplier (the value is then adapted based on the
1732 * write latency). The reason is that writes can be delayed under load and we
1733 * don't want readers to incorrectly assume that the filesystem is no longer
1734 * in use.
1735 */
1736 #define EXT4_MMP_CHECK_MULT 2UL
1737
1738 /*
1739 * Minimum interval for MMP checking in seconds.
1740 */
1741 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1742
1743 /*
1744 * Maximum interval for MMP checking in seconds.
1745 */
1746 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1747
1748 /*
1749 * Function prototypes
1750 */
1751
1752 /*
1753 * Ok, these declarations are also in <linux/kernel.h> but none of the
1754 * ext4 source programs needs to include it so they are duplicated here.
1755 */
1756 # define NORET_TYPE /**/
1757 # define ATTRIB_NORET __attribute__((noreturn))
1758 # define NORET_AND noreturn,
1759
1760 /* bitmap.c */
1761 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1762
1763 /* balloc.c */
1764 extern unsigned int ext4_block_group(struct super_block *sb,
1765 ext4_fsblk_t blocknr);
1766 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1767 ext4_fsblk_t blocknr);
1768 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1769 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1770 ext4_group_t group);
1771 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1772 ext4_fsblk_t goal,
1773 unsigned int flags,
1774 unsigned long *count,
1775 int *errp);
1776 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
1777 s64 nblocks, unsigned int flags);
1778 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1779 extern void ext4_check_blocks_bitmap(struct super_block *);
1780 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1781 ext4_group_t block_group,
1782 struct buffer_head ** bh);
1783 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1784 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1785 ext4_group_t block_group);
1786 extern void ext4_init_block_bitmap(struct super_block *sb,
1787 struct buffer_head *bh,
1788 ext4_group_t group,
1789 struct ext4_group_desc *desc);
1790 extern unsigned ext4_free_blocks_after_init(struct super_block *sb,
1791 ext4_group_t block_group,
1792 struct ext4_group_desc *gdp);
1793 extern unsigned ext4_num_base_meta_clusters(struct super_block *sb,
1794 ext4_group_t block_group);
1795 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1796 ext4_group_t block_group,
1797 struct ext4_group_desc *gdp);
1798 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1799
1800 /* dir.c */
1801 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1802 struct file *,
1803 struct ext4_dir_entry_2 *,
1804 struct buffer_head *, unsigned int);
1805 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1806 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1807 (de), (bh), (offset)))
1808 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1809 __u32 minor_hash,
1810 struct ext4_dir_entry_2 *dirent);
1811 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1812
1813 /* fsync.c */
1814 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1815 extern int ext4_flush_completed_IO(struct inode *);
1816
1817 /* hash.c */
1818 extern int ext4fs_dirhash(const char *name, int len, struct
1819 dx_hash_info *hinfo);
1820
1821 /* ialloc.c */
1822 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1823 const struct qstr *qstr, __u32 goal);
1824 extern void ext4_free_inode(handle_t *, struct inode *);
1825 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1826 extern unsigned long ext4_count_free_inodes(struct super_block *);
1827 extern unsigned long ext4_count_dirs(struct super_block *);
1828 extern void ext4_check_inodes_bitmap(struct super_block *);
1829 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1830 extern int ext4_init_inode_table(struct super_block *sb,
1831 ext4_group_t group, int barrier);
1832
1833 /* mballoc.c */
1834 extern long ext4_mb_stats;
1835 extern long ext4_mb_max_to_scan;
1836 extern int ext4_mb_init(struct super_block *, int);
1837 extern int ext4_mb_release(struct super_block *);
1838 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1839 struct ext4_allocation_request *, int *);
1840 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1841 extern void ext4_discard_preallocations(struct inode *);
1842 extern int __init ext4_init_mballoc(void);
1843 extern void ext4_exit_mballoc(void);
1844 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1845 struct buffer_head *bh, ext4_fsblk_t block,
1846 unsigned long count, int flags);
1847 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1848 ext4_group_t i, struct ext4_group_desc *desc);
1849 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1850 ext4_fsblk_t block, unsigned long count);
1851 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1852
1853 /* inode.c */
1854 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1855 ext4_lblk_t, int, int *);
1856 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1857 ext4_lblk_t, int, int *);
1858 int ext4_get_block(struct inode *inode, sector_t iblock,
1859 struct buffer_head *bh_result, int create);
1860
1861 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1862 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1863 extern int ext4_setattr(struct dentry *, struct iattr *);
1864 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1865 struct kstat *stat);
1866 extern void ext4_evict_inode(struct inode *);
1867 extern void ext4_clear_inode(struct inode *);
1868 extern int ext4_sync_inode(handle_t *, struct inode *);
1869 extern void ext4_dirty_inode(struct inode *, int);
1870 extern int ext4_change_inode_journal_flag(struct inode *, int);
1871 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1872 extern int ext4_can_truncate(struct inode *inode);
1873 extern void ext4_truncate(struct inode *);
1874 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1875 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1876 extern void ext4_set_inode_flags(struct inode *);
1877 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1878 extern int ext4_alloc_da_blocks(struct inode *inode);
1879 extern void ext4_set_aops(struct inode *inode);
1880 extern int ext4_writepage_trans_blocks(struct inode *);
1881 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1882 extern int ext4_block_truncate_page(handle_t *handle,
1883 struct address_space *mapping, loff_t from);
1884 extern int ext4_block_zero_page_range(handle_t *handle,
1885 struct address_space *mapping, loff_t from, loff_t length);
1886 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1887 struct address_space *mapping, loff_t from,
1888 loff_t length, int flags);
1889 extern int ext4_discard_partial_page_buffers_no_lock(handle_t *handle,
1890 struct inode *inode, struct page *page, loff_t from,
1891 loff_t length, int flags);
1892 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1893 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1894 extern void ext4_da_update_reserve_space(struct inode *inode,
1895 int used, int quota_claim);
1896 extern int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock);
1897
1898 /* indirect.c */
1899 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1900 struct ext4_map_blocks *map, int flags);
1901 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1902 const struct iovec *iov, loff_t offset,
1903 unsigned long nr_segs);
1904 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1905 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1906 extern void ext4_ind_truncate(struct inode *inode);
1907
1908 /* ioctl.c */
1909 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1910 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1911
1912 /* migrate.c */
1913 extern int ext4_ext_migrate(struct inode *);
1914
1915 /* namei.c */
1916 extern int ext4_orphan_add(handle_t *, struct inode *);
1917 extern int ext4_orphan_del(handle_t *, struct inode *);
1918 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1919 __u32 start_minor_hash, __u32 *next_hash);
1920
1921 /* resize.c */
1922 extern int ext4_group_add(struct super_block *sb,
1923 struct ext4_new_group_data *input);
1924 extern int ext4_group_extend(struct super_block *sb,
1925 struct ext4_super_block *es,
1926 ext4_fsblk_t n_blocks_count);
1927
1928 /* super.c */
1929 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1930 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1931 extern void ext4_kvfree(void *ptr);
1932 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1933 const char *, ...)
1934 __attribute__ ((format (printf, 4, 5)));
1935 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1936 __LINE__, ## message)
1937 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1938 ext4_fsblk_t, const char *, ...)
1939 __attribute__ ((format (printf, 5, 6)));
1940 extern void ext4_error_file(struct file *, const char *, unsigned int,
1941 ext4_fsblk_t, const char *, ...)
1942 __attribute__ ((format (printf, 5, 6)));
1943 extern void __ext4_std_error(struct super_block *, const char *,
1944 unsigned int, int);
1945 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1946 const char *, ...)
1947 __attribute__ ((format (printf, 4, 5)));
1948 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1949 __LINE__, ## message)
1950 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1951 const char *, ...)
1952 __attribute__ ((format (printf, 4, 5)));
1953 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1954 __LINE__, ## message)
1955 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1956 __attribute__ ((format (printf, 3, 4)));
1957 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1958 const char *, unsigned int, const char *);
1959 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1960 __LINE__, msg)
1961 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1962 struct super_block *, ext4_group_t, \
1963 unsigned long, ext4_fsblk_t, \
1964 const char *, ...)
1965 __attribute__ ((format (printf, 7, 8)));
1966 #define ext4_grp_locked_error(sb, grp, message...) \
1967 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1968 extern void ext4_update_dynamic_rev(struct super_block *sb);
1969 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1970 __u32 compat);
1971 extern int ext4_update_rocompat_feature(handle_t *handle,
1972 struct super_block *sb, __u32 rocompat);
1973 extern int ext4_update_incompat_feature(handle_t *handle,
1974 struct super_block *sb, __u32 incompat);
1975 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1976 struct ext4_group_desc *bg);
1977 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1978 struct ext4_group_desc *bg);
1979 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1980 struct ext4_group_desc *bg);
1981 extern __u32 ext4_free_group_clusters(struct super_block *sb,
1982 struct ext4_group_desc *bg);
1983 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1984 struct ext4_group_desc *bg);
1985 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1986 struct ext4_group_desc *bg);
1987 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1988 struct ext4_group_desc *bg);
1989 extern void ext4_block_bitmap_set(struct super_block *sb,
1990 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1991 extern void ext4_inode_bitmap_set(struct super_block *sb,
1992 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1993 extern void ext4_inode_table_set(struct super_block *sb,
1994 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1995 extern void ext4_free_group_clusters_set(struct super_block *sb,
1996 struct ext4_group_desc *bg,
1997 __u32 count);
1998 extern void ext4_free_inodes_set(struct super_block *sb,
1999 struct ext4_group_desc *bg, __u32 count);
2000 extern void ext4_used_dirs_set(struct super_block *sb,
2001 struct ext4_group_desc *bg, __u32 count);
2002 extern void ext4_itable_unused_set(struct super_block *sb,
2003 struct ext4_group_desc *bg, __u32 count);
2004 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2005 struct ext4_group_desc *gdp);
2006 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2007 struct ext4_group_desc *gdp);
2008
2009 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2010 {
2011 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2012 le32_to_cpu(es->s_blocks_count_lo);
2013 }
2014
2015 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2016 {
2017 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2018 le32_to_cpu(es->s_r_blocks_count_lo);
2019 }
2020
2021 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2022 {
2023 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2024 le32_to_cpu(es->s_free_blocks_count_lo);
2025 }
2026
2027 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2028 ext4_fsblk_t blk)
2029 {
2030 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2031 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2032 }
2033
2034 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2035 ext4_fsblk_t blk)
2036 {
2037 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2038 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2039 }
2040
2041 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2042 ext4_fsblk_t blk)
2043 {
2044 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2045 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2046 }
2047
2048 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2049 {
2050 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2051 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2052 le32_to_cpu(raw_inode->i_size_lo);
2053 else
2054 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2055 }
2056
2057 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2058 {
2059 raw_inode->i_size_lo = cpu_to_le32(i_size);
2060 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2061 }
2062
2063 static inline
2064 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2065 ext4_group_t group)
2066 {
2067 struct ext4_group_info ***grp_info;
2068 long indexv, indexh;
2069 grp_info = EXT4_SB(sb)->s_group_info;
2070 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2071 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2072 return grp_info[indexv][indexh];
2073 }
2074
2075 /*
2076 * Reading s_groups_count requires using smp_rmb() afterwards. See
2077 * the locking protocol documented in the comments of ext4_group_add()
2078 * in resize.c
2079 */
2080 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2081 {
2082 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2083
2084 smp_rmb();
2085 return ngroups;
2086 }
2087
2088 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2089 ext4_group_t block_group)
2090 {
2091 return block_group >> sbi->s_log_groups_per_flex;
2092 }
2093
2094 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2095 {
2096 return 1 << sbi->s_log_groups_per_flex;
2097 }
2098
2099 #define ext4_std_error(sb, errno) \
2100 do { \
2101 if ((errno)) \
2102 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2103 } while (0)
2104
2105 #ifdef CONFIG_SMP
2106 /* Each CPU can accumulate percpu_counter_batch blocks in their local
2107 * counters. So we need to make sure we have free blocks more
2108 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2109 */
2110 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2111 #else
2112 #define EXT4_FREEBLOCKS_WATERMARK 0
2113 #endif
2114
2115 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2116 {
2117 /*
2118 * XXX: replace with spinlock if seen contended -bzzz
2119 */
2120 down_write(&EXT4_I(inode)->i_data_sem);
2121 if (newsize > EXT4_I(inode)->i_disksize)
2122 EXT4_I(inode)->i_disksize = newsize;
2123 up_write(&EXT4_I(inode)->i_data_sem);
2124 return ;
2125 }
2126
2127 struct ext4_group_info {
2128 unsigned long bb_state;
2129 struct rb_root bb_free_root;
2130 ext4_grpblk_t bb_first_free; /* first free block */
2131 ext4_grpblk_t bb_free; /* total free blocks */
2132 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2133 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2134 struct list_head bb_prealloc_list;
2135 #ifdef DOUBLE_CHECK
2136 void *bb_bitmap;
2137 #endif
2138 struct rw_semaphore alloc_sem;
2139 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2140 * regions, index is order.
2141 * bb_counters[3] = 5 means
2142 * 5 free 8-block regions. */
2143 };
2144
2145 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2146 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2147
2148 #define EXT4_MB_GRP_NEED_INIT(grp) \
2149 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2150
2151 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2152 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2153 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2154 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2155 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2156 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2157
2158 #define EXT4_MAX_CONTENTION 8
2159 #define EXT4_CONTENTION_THRESHOLD 2
2160
2161 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2162 ext4_group_t group)
2163 {
2164 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2165 }
2166
2167 /*
2168 * Returns true if the filesystem is busy enough that attempts to
2169 * access the block group locks has run into contention.
2170 */
2171 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2172 {
2173 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2174 }
2175
2176 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2177 {
2178 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2179 if (spin_trylock(lock))
2180 /*
2181 * We're able to grab the lock right away, so drop the
2182 * lock contention counter.
2183 */
2184 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2185 else {
2186 /*
2187 * The lock is busy, so bump the contention counter,
2188 * and then wait on the spin lock.
2189 */
2190 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2191 EXT4_MAX_CONTENTION);
2192 spin_lock(lock);
2193 }
2194 }
2195
2196 static inline void ext4_unlock_group(struct super_block *sb,
2197 ext4_group_t group)
2198 {
2199 spin_unlock(ext4_group_lock_ptr(sb, group));
2200 }
2201
2202 static inline void ext4_mark_super_dirty(struct super_block *sb)
2203 {
2204 if (EXT4_SB(sb)->s_journal == NULL)
2205 sb->s_dirt =1;
2206 }
2207
2208 /*
2209 * Block validity checking
2210 */
2211 #define ext4_check_indirect_blockref(inode, bh) \
2212 ext4_check_blockref(__func__, __LINE__, inode, \
2213 (__le32 *)(bh)->b_data, \
2214 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2215
2216 #define ext4_ind_check_inode(inode) \
2217 ext4_check_blockref(__func__, __LINE__, inode, \
2218 EXT4_I(inode)->i_data, \
2219 EXT4_NDIR_BLOCKS)
2220
2221 /*
2222 * Inodes and files operations
2223 */
2224
2225 /* dir.c */
2226 extern const struct file_operations ext4_dir_operations;
2227
2228 /* file.c */
2229 extern const struct inode_operations ext4_file_inode_operations;
2230 extern const struct file_operations ext4_file_operations;
2231 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2232
2233 /* namei.c */
2234 extern const struct inode_operations ext4_dir_inode_operations;
2235 extern const struct inode_operations ext4_special_inode_operations;
2236 extern struct dentry *ext4_get_parent(struct dentry *child);
2237
2238 /* symlink.c */
2239 extern const struct inode_operations ext4_symlink_inode_operations;
2240 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2241
2242 /* block_validity */
2243 extern void ext4_release_system_zone(struct super_block *sb);
2244 extern int ext4_setup_system_zone(struct super_block *sb);
2245 extern int __init ext4_init_system_zone(void);
2246 extern void ext4_exit_system_zone(void);
2247 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2248 ext4_fsblk_t start_blk,
2249 unsigned int count);
2250 extern int ext4_check_blockref(const char *, unsigned int,
2251 struct inode *, __le32 *, unsigned int);
2252
2253 /* extents.c */
2254 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2255 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2256 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2257 int chunk);
2258 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2259 struct ext4_map_blocks *map, int flags);
2260 extern void ext4_ext_truncate(struct inode *);
2261 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2262 loff_t length);
2263 extern void ext4_ext_init(struct super_block *);
2264 extern void ext4_ext_release(struct super_block *);
2265 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2266 loff_t len);
2267 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2268 ssize_t len);
2269 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2270 struct ext4_map_blocks *map, int flags);
2271 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2272 __u64 start, __u64 len);
2273 /* move_extent.c */
2274 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2275 __u64 start_orig, __u64 start_donor,
2276 __u64 len, __u64 *moved_len);
2277
2278 /* page-io.c */
2279 extern int __init ext4_init_pageio(void);
2280 extern void ext4_exit_pageio(void);
2281 extern void ext4_ioend_wait(struct inode *);
2282 extern void ext4_free_io_end(ext4_io_end_t *io);
2283 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2284 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2285 extern void ext4_io_submit(struct ext4_io_submit *io);
2286 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2287 struct page *page,
2288 int len,
2289 struct writeback_control *wbc);
2290
2291 /* mmp.c */
2292 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2293
2294 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2295 enum ext4_state_bits {
2296 BH_Uninit /* blocks are allocated but uninitialized on disk */
2297 = BH_JBDPrivateStart,
2298 BH_AllocFromCluster, /* allocated blocks were part of already
2299 * allocated cluster. Note that this flag will
2300 * never, ever appear in a buffer_head's state
2301 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2302 * this is used. */
2303 };
2304
2305 BUFFER_FNS(Uninit, uninit)
2306 TAS_BUFFER_FNS(Uninit, uninit)
2307
2308 /*
2309 * Add new method to test wether block and inode bitmaps are properly
2310 * initialized. With uninit_bg reading the block from disk is not enough
2311 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2312 */
2313 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2314
2315 static inline int bitmap_uptodate(struct buffer_head *bh)
2316 {
2317 return (buffer_uptodate(bh) &&
2318 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2319 }
2320 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2321 {
2322 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2323 }
2324
2325 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2326
2327 /* For ioend & aio unwritten conversion wait queues */
2328 #define EXT4_WQ_HASH_SZ 37
2329 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2330 EXT4_WQ_HASH_SZ])
2331 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2332 EXT4_WQ_HASH_SZ])
2333 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2334 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2335
2336 #define EXT4_RESIZING 0
2337 extern int ext4_resize_begin(struct super_block *sb);
2338 extern void ext4_resize_end(struct super_block *sb);
2339
2340 #endif /* __KERNEL__ */
2341
2342 #endif /* _EXT4_H */
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